Lifting-jack



model. I

GENOWAYS LIFTING J No. 269,661. Patented 1300.26, 1882.

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PATENT LlFTlNG -JACK.

SPECIFICATION forming part of Letters Patent No';-269,661, dated December 26, 1882.

Application filed January 14, 1882. (Model) 1'0 all whom it may concern:

Be it known that I, CLINTON L. GENO- WAYS, of Williamsburg, in the county of Olermont and State of Ohio, have invented a new and useful Improvement in a'Oombined Tire- Tightener and Lifting-Jack, which is intended as an improvement upon the device invented by me and patented December 14, 1880, and numbered 235,610, of which the following is a specification.

My invention relates to lifting-jacks, its object being to provide therefor a movable head or heads of such construction that the jack will .be enabled to adapt and adjust itself to bearing-surfaces not parallel; to which end it consists in the combination, with the liftingjack, of a movable and selt adjustable head or heads of peculiar construction, which afiord. a secure adj ustablo bearing for the jack and enable it to act effieiently and without undue strains between surfaces not parallel.

My invention is embodied in the mechanism illustrated in the accompanying drawings, exhibiting a jack having right and left hand screws connected and operated in the same axial line by a swivel, by whose rotation the screws are forced apart.

In the drawings, Figure l is a vertical elevation of my improved jack complete. Figs. 2 and 3 are detached side and end views ofthe adjustable head detached; and Figs. 4 and 5 are side and end elevations of one of the screws detached from the swivel.

The swiveling yoke A, right and left hand screws 1) 1), arranged in the same axial line through the end walls of the yoke A, with which the screws engage, and the adjustable heads B B at the outer ends of the screws, constitute thejack to which my improvement is applied. The construction of the yoke and screws is obvious and requires no description. To receive the adjustable heads the screws are formed at their outer ends into tongues c c, flanked on opposite sides by similar semi-cylindrical shoulders, (Z d, as shown in Figs. 4 and 5, which constitute the bearing abntments of the screws in and against their adjustable heads. The heads B B are concave on the under side, as shown in Fig. 3, to fit over and upon the abutmeuts dd, the concavity being cut across its axis by an open slot, as shown in Fig. 2, to receive the tongues c c. The parts being fitted together, the tongue 0 fits within its slot, so as to permit the head to rest and move concentrically upon the shoulders d,-

faces of the head B, and through a slot, a,-

formed in the tongue 0, concentric with the shoulders (I. Thismode of connection, as will be obvious, permits the movement of the head B without allowing the head B to become detached.

With this explanation of the construction the adjust-ability of the heads B to the angles of the resisting-surfaces, as illustrated by the position of the heads in Fig. 1, will be obvious.

The adaptability of the apparatus to use as a tire-tightener will also be clearly apparent, the adjustability of the heads to the radial angle between adjacent spokes being a feature of obviousvalue and utility.

I have shown and described in the drawings and foregoing description a form of apparatus and construction of parts in which my improvement is most clearly apparent; but it will be obvious that the principle of the invention can be embodied in various other forms of mechanism-as, for example, ajack having a single screw-shaft with right and left hand threads operating between two hollow heads, or even a jack having a single screw and a hollow head or base. It will also be evident that the benefits of my improvement can be attained in a degree by using but one movable head in the type of apparatus illustrated in the drawings, and I regard all such constructions as within the spirit of my invention.

Having described my invention, I claim and desire to secure by Letters Patent-- 1. A lilting-jack having its lifting bar or bars terminated by convex bearing-shoulders and a central tongue adapted to engage with and bear upon a correspondiugly-formed head having concave bearing-shoulders and a central slot, substantially as and for the purpose specified.

2. The lifting-bars D, terminating in bearing-shoulders d d, and tongue 0, provided with curved slot at, in combination with the block B and retaining-pin b, substantially as set forth.

CLINTON L. GENOWAYS. Witnesses:

JOHN WATT, J. W. WARING. 

